//******************************************************
// *                                                   *
// * NAME         : Rasesh Patel                       *
// * Program Name : PWM LED Fader.ino                  *
// * Date         : 2023-03-21                         *
// * Desc         : This program has an rgb LED which  *
// *                is controlled by potentiometer     *
// *                and the rgb values are displayed   *
// *                on a LCD display                   *
// *                                                   *
//******************************************************

#include <LiquidCrystal_I2C.h>                          // including lcd display libraries

#define I2C_ADDR    0x27                                // defining address of the lcd 
#define LCD_COLUMNS 16                                  // defining number of coloumns for lcd
#define LCD_LINES   2                                   // defining number of line for lcd

LiquidCrystal_I2C lcd (I2C_ADDR, LCD_COLUMNS, LCD_LINES);      //creating a lcd project based on the columns and lines defined

int redLED = 6;                                   // pin for redLED
int greenLED = 5;                                 // pin for greenLED
int blueLED = 3;                                  // pin for blueLEd
int redPot = A0;                                  // pin for redLED potentiometer
int greenPot = A1;                                // pin for greenLED potentiometer
int bluePot = A2;                                 // pin for blueLED potentiometer
int redValue = 0;                                 // value from the potentiometer
int greenValue = 0;                               // value from the potentiometer
int blueValue = 0;                                // value from the potentiometer

void setup() {
 
  lcd.init();                                     // starting the lcd display
  lcd.backlight();                                // turn on the lcd display backlight
  lcd.setCursor(0, 0);                            // set cursor on lcd display
  lcd.print("RPLED Fader v1.0");                  // intial print on the lcd dispay

  // put your setup code here, to run once:
  pinMode(redLED, OUTPUT);                        // setting redLED pin as an output
  pinMode(greenLED, OUTPUT);                      // setting greenLED pin as an output
  pinMode(blueLED, OUTPUT);                       // setting blueLED pin as an output

  analogWrite(redLED, 255);                       // turning the redLED off to start
  analogWrite(greenLED, 255);                     // turning the greenLED off to start
  analogWrite(blueLED, 255);                      // turning the blueLED off to start
  delay(2000);                                    // wait 2000 ms
  lcd.setCursor(0,0);                             // set cursor location on lcd display
  lcd.print("RED   GRN   BLUE");                  // print the headers for the rgb values on the lcd display
} // end setup()

void loop() {
  // put your main code here, to run repeatedly:
  redValue = analogRead(redPot)/4;             // taking the potentiometer input value and dividing by 4 so it ranges from 0-255
  greenValue = analogRead(greenPot)/4;         // taking the potentiometer input value and dividing by 4 so it ranges from 0-255
  blueValue = analogRead(bluePot)/4;           // taking the potentiometer input value and dividing by 4 so it ranges from 0-255
  analogWrite(redLED, redValue);               // assigning red rgb value to redLED
  analogWrite(greenLED, greenValue);           // assigning green rgb value to greenLED
  analogWrite(blueLED, blueValue);             // assigning blue rgb value to blueLED

  lcd.setCursor(0,1);                          // set cursor location on lcd display
  lcd.print(redValue);                         // display the rgb value of redLED potentiometer

  lcd.setCursor(6,1);                          // set cursor location on lcd display
  lcd.print(greenValue);                       // display the rgb value of greenLED potentiometer

  lcd.setCursor(12,1);                         // set cursor location on lcd display
  lcd.print(blueValue);                        // display the rgb value of blueLED potentiometer

}// end loop()